Ground Speed / Distance Circular Slide Rule Distanz-Gerät DG21A3
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Ground Speed / Distance Circular Slide Rule Distanz-Gerät DG21A3
Fank Boës
150
50
km
mi
NM
6
10
5
5
20
10
10
30
15
15
40
20
20
25
25
60
30
30
70
35
35
80
40
40
90
45
45
100
50
50
km/h
mph
kn
-
-
-
600
300
300
-
-
-
700
350
-
-
-
400
400
-
50
25
25
100
50
50
150
75
75
200
100
100
250
125
125
300
150
150
350
175
175
400
200
200
-
-
-
500
250
250
kn
mph
km/h
NM
mi
km
450
1
2
3
4
5
7
8
9
10
11
12
13
14
15
20
25
30
35
40
45
50
55
60
min
min
130
230
330
430
530
-
-
-
-
630
15
25
35
45
55
65
75
85
Ground Speed / DistanceCircular Slide RuleDistanz-Gerät DG21A3
6
6
7
7
8
8
9
9
11
11
12
12
13
13
14
14
30
30
30
200
100
100
110
55
55
120
60
60
130
65
65
140
70
70
-
75
75
160
80
80
-
85
85
180
90
90
-
-
-
-
110
-
120
5
9
8
7
6
3
3
4
4
14
11
12
13
19
16
17
18
-
-
-
-
79
64
21
40
Print on cardboard.
Cut out both discs,
viewport and center holes.
Connect both discs via a
single paper fastner.
© 2021 Creative Commons BY
Frank Boës
200
m/s
m/s
10
20
30
40
50
60
70
80
-
100
-
-
-
-
-
km/h
mph
kn
m/s
kn
mph
km/h
m/s